Playground structure



FIG. 1 is a perspective view of a playground structure showing our design;

FIG. 2 is a side elevation taken from the left of FIG. 1;

FIG. 3 is a side elevation taken from the opposite side shown in FIG. 1; and

FIG. 4 is a bottom plan view. 

The ornamental design for a playground structure, substantially as shown and described. 